To update a bit, the guy in question has not been back since my last class. In my last class I purposely structured my class to disable the behavior he was exhibiting. If he was correcting his partner, I'd take his partner from him, because in my mind if he's correcting his partner then his partner needs to be tutored, and I told him as much. I purposely did ukemi drills when I saw he wasn't take ukemi and even encouraging his partner to not take the type of ukemi we take at our school. So obviously the class needed a refresher on ukemi. When he interrupted me while I was demonstrating I cut him off quickly and said "We can discuss it after class or at open mat" or I specifically explained to the class in detail why what the guy was saying wouldn't work for what we were doing.
I was respectful and firm. And he left visibly irritated because he couldn't do what he wanted to do. Hasn't returned to any class since.